source: src/Shapes/ShapeOps.cpp@ 2ad482

/*
 * ShapeOps.cpp
 *
 *  Created on: Jun 18, 2010
 *      Author: crueger
 */

#include "Shapes/ShapeOps.hpp"
#include "Shapes/ShapeOps_impl.hpp"

#include "Helpers/Assert.hpp"

/*************** Base case ***********************/

ShapeOpsBase_impl::ShapeOpsBase_impl(const Shape::impl_ptr &_arg) :
  arg(_arg){}

ShapeOpsBase_impl::~ShapeOpsBase_impl(){}

bool ShapeOpsBase_impl::isInside(const Vector &point){
  return arg->isInside(translateIn(point));
}

bool ShapeOpsBase_impl::isOnSurface(const Vector &point){
  return arg->isOnSurface(translateIn(point));
}

Vector ShapeOpsBase_impl::getNormal(const Vector &point) throw (NotOnSurfaceException){
  Vector helper = translateIn(point);
  if(!arg->isOnSurface(helper)){
    throw NotOnSurfaceException(__FILE__,__LINE__);
  }
  Vector res = translateOutNormal(arg->getNormal(helper));
  res.Normalize();
  return res;
}

LineSegmentSet ShapeOpsBase_impl::getLineIntersections(const Line &line){
  Line newLine(translateIn(line.getOrigin()),translateIn(line.getDirection()));
  LineSegmentSet res(line);
  LineSegmentSet helper = getArg()->getLineIntersections(newLine);
  for(LineSegmentSet::iterator iter = helper.begin();iter!=helper.end();++iter){
    LinePoint lpBegin = iter->getBegin();
    LinePoint lpEnd = iter->getBegin();
    // translate both linepoints
    lpBegin = lpBegin.isNegInfinity()?
                line.negEndpoint():
                line.getLinePoint(translateOutPos(lpBegin.getPoint()));
    lpEnd = lpEnd.isPosInfinity()?
              line.posEndpoint():
              line.getLinePoint(translateOutPos(lpEnd.getPoint()));
    res.insert(LineSegment(lpBegin,lpEnd));
  }
  return res;
}

Shape::impl_ptr ShapeOpsBase_impl::getArg(){
  return arg;
}

/********************* Resize ********************/

Resize_impl::Resize_impl(const Shape::impl_ptr &_arg,double _size) :
  ShapeOpsBase_impl(_arg), size(_size)
{
  ASSERT(size>0,"Cannot resize a Shape to size zero or below");
}

Resize_impl::~Resize_impl(){}

Vector Resize_impl::translateIn(const Vector& point){
  return (1/size) * point;
}

Vector Resize_impl::translateOutPos(const Vector& point){
  return size * point;
}

Vector Resize_impl::translateOutNormal(const Vector& point){
  return point;
}

string Resize_impl::toString(){
  stringstream sstr;
  sstr << "resize(" << getArg()->toString() << "," << size << ")";
  return sstr.str();
}

Shape resize(const Shape &arg,double size){
  Shape::impl_ptr impl = Shape::impl_ptr(new Resize_impl(getShapeImpl(arg),size));
  return Shape(impl);
}

/*************************** translate *******************/

Translate_impl::Translate_impl(const Shape::impl_ptr &_arg, const Vector &_offset) :
  ShapeOpsBase_impl(_arg),offset(_offset)
{}

Translate_impl::~Translate_impl(){}

Vector Translate_impl::translateIn(const Vector& point){
  return point-offset;
}

Vector Translate_impl::translateOutPos(const Vector& point){
  return point+offset;
}

Vector Translate_impl::translateOutNormal(const Vector& point){
  return point;
}

string Translate_impl::toString(){
  stringstream sstr;
  sstr << "translate(" << getArg()->toString() << "," << offset << ")";
  return sstr.str();
}

Shape translate(const Shape &arg, const Vector &offset){
  Shape::impl_ptr impl = Shape::impl_ptr(new Translate_impl(getShapeImpl(arg),offset));
  return Shape(impl);
}

/*********************** stretch ******************/

Stretch_impl::Stretch_impl(const Shape::impl_ptr &_arg, const Vector &_factors) :
  ShapeOpsBase_impl(_arg),factors(_factors)
{
  ASSERT(factors[0]>0,"cannot stretch a shape by a negative amount");
  ASSERT(factors[1]>0,"cannot stretch a shape by a negative amount");
  ASSERT(factors[2]>0,"cannot stretch a shape by a negative amount");
  for(int i = NDIM;i--;){
    reciFactors[i] = 1/factors[i];
  }
}

Stretch_impl::~Stretch_impl(){}

Vector Stretch_impl::translateIn(const Vector& point){
  Vector helper=point;
  helper.ScaleAll(reciFactors);
  return helper;
}

Vector Stretch_impl::translateOutPos(const Vector& point){
  Vector helper=point;
  helper.ScaleAll(factors);
  return helper;
}

Vector Stretch_impl::translateOutNormal(const Vector& point){
  Vector helper=point;
  // the normalFactors are derived from appearances of the factors
  // with in the vectorproduct
  Vector normalFactors;
  normalFactors[0]=factors[1]*factors[2];
  normalFactors[1]=factors[0]*factors[2];
  normalFactors[2]=factors[0]*factors[1];
  helper.ScaleAll(normalFactors);
  return helper;
}

string Stretch_impl::toString(){
  stringstream sstr;
  sstr << "stretch(" << getArg()->toString() << "," << factors << ")";
  return sstr.str();
}

Shape stretch(const Shape &arg, const Vector &factors){
  Shape::impl_ptr impl = Shape::impl_ptr(new Stretch_impl(getShapeImpl(arg),factors));
  return Shape(impl);
}

/************************* transform *****************/

Transform_impl::Transform_impl(const Shape::impl_ptr &_arg, const Matrix &_transformation) :
  ShapeOpsBase_impl(_arg),transformation(_transformation)
{
  transformationInv = transformation.invert();
}

Transform_impl::~Transform_impl(){}

Vector Transform_impl::translateIn(const Vector& point){
  return transformationInv * point;
}

Vector Transform_impl::translateOutPos(const Vector& point){
  return transformation * point;
}

Vector Transform_impl::translateOutNormal(const Vector& point){
  Matrix mat = transformation.invert().transpose();
  return mat * point;
}

string Transform_impl::toString(){
  stringstream sstr;
  sstr << "transform(" << getArg()->toString() << "," << transformation << ")";
  return sstr.str();
}

Shape transform(const Shape &arg, const Matrix &transformation){
  Shape::impl_ptr impl = Shape::impl_ptr(new Transform_impl(getShapeImpl(arg),transformation));
  return Shape(impl);
}